What is Semax?
Semax is a synthetic heptapeptide derived from the ACTH (adrenocorticotropic hormone) fragment 4-7. Developed in Russia in the 1980s by the Institute of Molecular Genetics, it has been used as a prescription medication in Russia and Ukraine for stroke recovery, cognitive impairment, and anxiety for decades. In Western research communities it has gained significant attention as a nootropic peptide with an unusually strong BDNF-upregulating profile.
Unlike many nootropic compounds that provide acute stimulation, Semax's most interesting property is its ability to significantly increase brain-derived neurotrophic factor (BDNF) — a protein critical for neuronal growth, synaptic plasticity, and long-term cognitive function. BDNF is often described as "fertilizer for the brain."
Key finding: Semax produces up to a 4-8x increase in BDNF expression in the hippocampus in animal models — one of the largest BDNF responses observed for any research compound. This drives significant interest in its neuroprotective and cognitive enhancement potential.
BDNF Upregulation — Why It Matters
BDNF (Brain-Derived Neurotrophic Factor) supports the survival of existing neurons and encourages the growth and differentiation of new neurons and synapses. Low BDNF is associated with depression, cognitive decline, and neurodegenerative conditions. Exercise is one of the most potent natural BDNF stimulants — Semax appears to replicate much of this effect pharmacologically.
Research applications for BDNF upregulation include: cognitive enhancement, depression research, stroke recovery, traumatic brain injury models, neurodegeneration prevention, and learning/memory enhancement.
Research Findings
- Stroke recovery: Extensive Russian clinical research shows improved outcomes in stroke patients — reduced deficit severity, faster recovery timelines
- Cognitive performance: Improved memory, attention, and information processing in multiple study designs
- Neuroprotection: Protective effects in models of hypoxia and ischemia — relevant to stroke and TBI research
- ADHD models: Research suggests dopaminergic and noradrenergic pathway modulation
- Anxiety: Some research shows anxiolytic properties without sedation
Semax vs Selank
These two peptides are often compared as they're both Russian-developed nootropics, but they have meaningfully different profiles: Semax is more activating — energizing, BDNF-driven, performance-oriented. Selank is more anxiolytic — calming, anti-anxiety, GABA-modulating. Many researchers stack them for coverage of both cognitive performance and anxiety reduction.
Dosing Protocols
Semax comes in 10mg vials. It is notably effective via intranasal administration as well as subcutaneous — intranasal delivery reaches the brain more directly via the olfactory pathway. Research protocols vary widely by application. Lower doses are used for cognitive enhancement protocols; higher doses for neuroprotection research.
Where to Buy Semax
Semax is one of the peptides with the most variance in quality between vendors — synthesis purity significantly affects the BDNF response. UNYX Peptides carries Semax 10mg, US-manufactured at their GMP Arizona facility.
- The only major domestic US manufacturer — everything is made here, not imported
- GMP-certified Arizona facility — highest manufacturing standards in the space
- Purest peptides available — third-party tested, consistent batch quality
- Full catalog, same-day shipping, bac water in stock